20894-13-7Relevant articles and documents
Rasta resin as support for TBD in base-catalyzed organic processes
Bonollo, Simona,Lanari, Daniela,Angelini, Tommaso,Pizzo, Ferdinando,Marrocchi, Assunta,Vaccaro, Luigi
experimental part, p. 216 - 222 (2012/03/08)
Although its intriguing features, such as uniform functionalization through the entire beads and a very high-loading capacity are suitable candidates for solid-phase synthesis and reagent-scavenging, the use of Rasta resin as support for organocatalysis has been little explored. In this contribution, Rasta polymer has been used to preparation of high-loading Rasta-TBD. This catalyst has been able to efficiently promote several organic transformations with constantly good and promising results.
Polystyryl-BEMP as an efficient recyclable catalyst for the nucleophilic addition of nitroalkanes to α,β-unsaturated carbonyl compounds under solvent-free conditions
Ballini,Barboni,Castrica,Fringuelli,Lanari,Pizzo,Vaccarob
supporting information; experimental part, p. 1218 - 1224 (2009/05/30)
2-tert-Butylimino-2-diethylamino-1,3-dimethylperhydro-1,3, 2-diazaphosphorine supported on polystyrene (PS-BEMP) is an efficient catalyst for the addition of nitroalkanes (1-1.5 equiv.) to α,β-unsaturated carbonyl compounds (1.0 equiv.) in the absence of a reaction medium (solvent-free conditions). The corresponding γ-nitro carbonyl compounds have been isolated in excellent yields but the catalyst can be satisfactorily recovered and used for only 3 times due to the magnetic stirring which caused crunching of the catalyst beads thus hampering its complete recovery. To optimize the catalyst's reuse and improve the environmental efficacy of solvent-free conditions, the first solvent-free cyclic continuous-flow reactor has been set up. This reactor has allowed the product to be isolated in an almost quantitative yield by using a very small amount of organic solvent, making the recovery and reuse of the catalyst efficient and reproducible.
Asymmetric conjugate addition of nitroalkanes to enones with a chiral α-aminophosphonate catalyst
Malmgren, Marcus,Granander, Johan,Amedjkouh, Mohamed
, p. 1934 - 1940 (2008/12/22)
Chiral diethyl (2R)-tetrahydropyrro-2-ylphosphonate is an effective catalyst for the Michael addition of nitroalkanes to α,β-unsaturated ketones. This study revealed that the hydrate salt of this α-aminophosphonate was found to be a better catalytic speci
Phase transfer catalysed reaction of potassium superoxide with some nitroalkanes in the presence of α,β-unsaturated enones
Singh, Krishna Nand,Raghuvanshi, Raghvendra Singh,Singh, Manorama
, p. 829 - 833 (2008/09/18)
Superoxide ion, generated in situ by the phase transfer reaction of potassium superoxide and 18-crown-6 ether, brings about an easy Michael addition of nitroalkanes to α,β-unsaturated enones to afford 1,4-addition products.
Solvent-free synthesis of γ-nitroketones and γ-nitroesters promoted by the ionic liquid/K2CO3 catalytic system
Zlotin, Sergey G.,Bogolyubov, Andrey V.,Kryshtal, Galina V.,Zhdankina, Galina M.,Struchkova, Marina I.,Tartakovsky, Vladimir A.
, p. 3849 - 3854 (2008/02/10)
A convenient solvent-free synthesis of γ-nitroketones and γ-nitroesters based on the reaction of nitroalkanes with α,β-unsaturated carbonyl compounds in the ultrasonically activated heterogeneous catalytic system 1-butyl-3-methylimidazolium tetrafluorobor
Peracid Oxidation of 1-Pyrroline 1-Oxides
Bapat, Jayant Bhalchandra,Durie, Alexander
, p. 211 - 219 (2007/10/02)
Peracid oxidation of twelve 1-pyrroline 1-oxides (a class of cyclic nitrones) has been carried out.Those compounds without a substituent in position 2 yielded the corresponding hydroxamic acids. 2-Phenyl-substituted 1-pyrroline 1-oxides gave nitro ketones
Preparation de pyrrolines N-oxydes, pyrrolines et pyrrolidines par reduction electrochimique de γ-nitrocetones
Cariou,Hazard,Jubault,Tallec
, p. 3961 - 3964 (2007/10/02)
Judiciously selected conditions of controlled potential electrolysis, at a mercury cathode in aqueous organic media, of γ-nitroketones result in quantitative yields of 1-pyrroline 1-oxides, pyrrolines or pyrrolidines.
